4/14/15 Objective: How are protists classified? Do Now: What do you put/find in a junk drawer?

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Presentation transcript:

4/14/15 Objective: How are protists classified? Do Now: What do you put/find in a junk drawer?

What’s in a junk drawer? Kingdom Protista is very diverse and where scientists place eukaryotes that are not animals, plants, or fungus.

Basic Characteristics of Protists Have eukaryotic cells (has a nucleus and organelles) Most are unicellular, algae is multicellular Very diverse kingdom

Protist Complexity The protist’s one cell must carry out many processes, so considered to be the most complex of eukaryotic cells

Protists are grouped by how they get nutrition 1. Animal-like protists (protozoans) - heterotrophs 2. Fungus-like protists are heterotrophs that decompose 3. Plant-like protists (algae) are autotrophs

Protozoans (Protozoa = “little animal”) 1. Heterotrophs 2. Can move like most animals Different because they are unicellular Animal-like protists, resemble animals in 2 ways

1. Protozoans With Flagella Zooflagellates: Move by flagella Reproduce asexually by binary fission

Specific Zooflagelletes 1. Trichonympha: live in the gut of termites, enzymes digest cellulose in wood 2. Trypanosoma: parasitic, causes African Sleeping sickness spread by tsetse fly 3. Giardia: parasitic, lives in intestines, found in contaminated drinking water

2. Protozoans With Pseudopodia Protozoans that move by extending lobes of cytoplasm

Pseudopod Pseudopod: Extensions of cytoplasm Pseudopod = “false foot” zJ_pA Ex: Amoeba

3. Protozoans With Cilia Ciliates: Found free-living in freshwater envts. Short hair-like projections called cilia to move and feed

3. Protozoans With Cilia Paramecium : A ciliate with many rows of cilia for movement D7TvY

Paramecium

3. Protozoans With Cilia Some ciliates have just clusters of cilia in tufts like Stentor who uses its cilia “tuft” to capture food C9FEw

4. Protozoans Lacking Motility (Apicomplexans) Spore-forming parasites (Sporozoans) No structure for movement, need host to reproduce Spore = reproductive cell

4. Protozoans Lacking Motility (Apicomplexans) Plasmodium The organism that causes malaria in humans, spread by infected mosquitoes O0lXE&list=PL0BFC02A301F673F3&index =3&feature=plpp_video KqwZw&feature=bf_next&list=PL0BFC02A 301F673F3&lf=plpp_video O97Zg&feature=bf_next&list=PL0BFC02A 301F673F3&lf=plpp_video forY\